Many people are nervous about bacteria. Are all bacteria bad and unhealthy? Why or why not?
A. No. Humans have an average of 100 trillion bacteria cells living in and on each one of us called microbiome, which is essential for health. They digest food, develop immune systems, and protect us from disease. Other types of bacteria though, can be dangerous.
B. No. Bacteria is only unhealthy if it gets inside you. The skin forms a protective barrier that prevents bacteria from getting inside, but if it does it always leads to sickness or disease.
C. Yes. Bacteria called microbiome is dangerous bacteria that can get on human skin and in the gut. Microbiome is a unicellular organism that is too small to see, so we must be cautious not to get it inside the body or it can cause sickness and disease.
D. Yes. All bacteria, even a single bacteria cell is dangerous.
Preview next quiz:
Do both animal and plant cells have chloroplasts? Explain why or why not.
A. No, not all. Chloroplasts contain a green pigment called chlorophyll. All plant cells have chloroplasts, but only some animal cells, such as green frogs, have chloroplasts.
B. Yes. Chloroplasts contain a green pigment called chlorophyll. All plant cells have chloroplasts, but only some animal cells, such as green frogs, have chloroplasts.
C. Yes. Chloroplasts transport important molecules for the cell to use. All cells need to be able to harness energy for food and chloroplasts get their name from chlorophyll, which is a green pigment used for photosynthesis giving plants their food. They are named chloroplasts because they were discovered in plant cells before they were discovered in animal cells.
D. No. Chloroplasts contain chlorophyll, which plants use to absorb light energy as part of photosynthesis. Animals do not perform photosynthesis, so they do not have chloroplasts.